Attachment for rock-drills for supplying water thereto.



C. HANSEN.

'ATTAQHMENT FOR ROCK DRILLSFOR SUPPLYING WATER THEREI'O.

APPLICATION FILED NOV. 14, I9I4.

srarnsrar assi ns.

CHARLES HANSEN, JOHANNESBURG, TRANSVAAL, SOUTH AFRICA.

ATTACHMENT FORBOCK-QQRLI LLS S UPPLYING THERETO.

Application filed November 14, 1914. Serial No. 872,175.

To all :whom it may concern:

Be it known that 1, CHARLES HANSEN, a

I subject of the King. of Great Britain, and

. trivances for supplying water through. the

bits, drills or steels of rock drilling machines to holes as they are being formed by such machines.

The objects of the invention are to provide an attachment which while being simplein construction,.ellicicnt in operation and inexpensive to manufacture, will lend itself to the quick and easy disengagement of the water supplyptpefroin the machine, and so facilitate the removal of the drill, lnt or steel; to insure that'a practically water-tight joint shall be made between" the water; sup- .ply pipe and the bit, drill o f steel; to supply means which shall not be unduly susceptible to the vibration setup by the rockdrill when in operation and so be worn out quickly as a rosult of such vibration, and, if desired, to obviate the shanking of the end of the drill or hit, which is necessary with some attachments as at,prcsent constructed.

The invention will be fully described with the aid of the attached-clrawings in which- Figure 1 is a side elevation of a known type of rock drilling'machi nc equipped with the invention. Fig. .2 is a part sectional elevation of the front headot the machine and the water supplying attachment'drawn to an enlarged scale and Fig. 3 is a front elevation of Fig. 2.

In Fig. 1 ofthc drawings,'the rock drilling machine denoted by the numeral 1, 2 representing the front head thereof wlnch, as shown, is resiliently bolted to the mail cylinder 3 of the machine.

t is the'bit, drill or steel which projects through an axial hole 2 through the head 2. and receives atits inner end 5, either directly or indirectly, the impacts of the hammer piston of the machine in a manner that is well understood. a

I employa hollow drill steel, that is to say a drill steelwhich is provided with an axial hole or other longitudinal .ole or passage l which extends from'a point near its rear end to and through the cutting end of the drill Specification of Letters Patent. I

steel. This hole or passage is utilized as 'a Patented May 4, 1915 conduit through which the water is conthere'is formed a transverse preferably forwardly inclined hole 4 which at its inner end communicates with the longitudinal passage l. A plurality of the transverse holes :t may be provided if desired. The-transverse hole 4 is preferably of smaller diameter than the longitudinal hole at. The shank or that portion of the drill steel 4' which is projected into the front head 2' is shown constructed with two fiat-sides 6-, 7 and rounded at the top and bottom as indicated at S, 9 to loosely fit theehole 2 through the head which hole is'of similar shape. The transverse hole 4, at its outer end termiot' the shank. Ordinary steel of hexagonal, octagonal or other section may be used to obviate sh'anking. The front head'2 isjconstructednvith two bossesor projections 10,. 11 positioned at opposite sides of the Horn; head. A hole 12 is formed through the boss 10, which hole communicates with the axial hole 2 and a hole. 13 is formed in the other boss '11 and in said hole is shrunk or otherwise fixed an eye-piece H. The hole 12, as shown in Fig. 3, communicates also with the transverse hole l in the shank of'the drill steel 4. r

1:) is a portion of the hose cant-her flexible pipe which is employed for conveying the water to the drill. The end of the pipe 15,

as is clearly shown in Fig. 2, is projected into the hole 12 and abuts the shank of-the'.

the external diameter of' which may be slightly greater than the internal diameter of the hose pipe so that some force is necessary to place it in position in the end there of. A small portion of the hose pipe 15 is allowed to project beyond the outer end of the rigid tube 16 so as to allow of contrac- 1 ,tion of the pipe when it is pushed into the hole 12. The ends of the tube 16 are preferably rounded, as shown, to prevent it.

cutting or otherwise damaging the hosepipe 15. As previously eXplained,-and shown in Fig. 2, when the end of the hose pipe 15 is projected into the hole 12, its inner end forms awater-tight joint around the transverse hole' l and thereby eiiectively prevents leakage of the water'at that point.

' The inner portion 12 of the hole 12 is made elliptical or oval, the longer or major axis being parallel to the axis of the drill steel. This admits of the movement of the inner end of the pipe 15 with the drill steel 4- when the latter is struck by the hammer piston.

17 isa ring or tubular piece which encircles the hose pipe 15 and partially enters the hole 12. This ring or piece 17 operates I to prevent undue expansion of the hose pipe when its extremity is forced into contact with the drill steelorfbit and also serves to;

- erably arranged in a direction parallel with the axis of the drill steel or bit. The clamp 18 is constructed on two opposite sides with lugs or projectingparts 21, 22, each having larged inner end to receive the eye-piece 14-. 7

a hole formed through it.

- 23 is a U bolt or bow piece, the threaded extremitiesofwhich are passed throu h the holes in the lugs 21,22 and securedt erein by means of nuts 24:, 25. The bow or bend of the U bolt 23 passes over the front head and is loosely attached to a lever 26 as for example by passingit through a hole .27 in the en" larged end 28. of said lever. The lever 26- is loosely pinned to the eye-piece 14 by means of a pin 29 so that said pin 29 serves as the fulcrum for the lever. Thelever lies parallel with the axis of the drillsteel and as shown in Fig. 3, it is, bifurcatedsat'its en- As. will be readily understood on reference to the drawings, the movement of the lever 26 in one direction, through the medium of the U bolt 23 draws the clamp 18 and through it the water .supply pipe 15, in the direction ofthe drill steel 1, and so forces the inner end of the flexible pipe against the drill steel l; the clamp 18 on the water supply pipe being so adjusted that sufficient contraction of the flexible pipe 15 is permitted to keep it pressed tightly against the drill steel around the transverse hole 4 to prevent leakage. The lever 26 is shown in the position in which it is placed to make a water-tight joint between the flexible pipe 15 and the shank of the steel iaround the hole 4. ,W'hen it is desired to remove the drill 4- the lever 26 is moved forward around i the fulcrum 29 through an angle ,of 180 'more or less into its other extreme position.

This moves the flexible supply pipe 15, through'the U bolt 23 and clamp 18, in a direction away from thedrill steel 4; and so allows of the easy removal of the latter.

As shown in Fig. 2 the center of the hole 27 is at the rear of the center of the fulcrum pin 29 when the lever 26 is in the position in which it is shown in Fig. 2. This results in-the lever 26 being locked against unintentional release. The pull of thehose I pipe on the U bolt 23 tends to keep the lever- 26 in its locked position.

What I claim' as my invention and desire to protect'by Letters Patent is z- 1. In a rock drill attachment of the nature indicated in combination a rock drill a drill steel mounted in the front end of said drill, said drill'steel having a longitudinal passage and a transverse passage communicating therewith, the drillhaving an opening which communicates with said transverse passage, a flexible water supply plpe'the extremity of which is projected into the opening in the drill and surrounds the transverse passage in the drill steel and means for forcing the end of said flexible pipe into said opening to form a watertight joint between it and the drill steel around the transverse hole.

2. Ina rock drill attachmentof the nature indicated in combination a rock drill a drill steel mounted in the front end of said passage and a transverse passage co1n municating therewith, thedrill having i an opening which communicateswithrsaid transverse passage, a flexible water supply pipe the extremity of which is projected-into the opening in the drill and surrounds the transverse'passage' in the drill steel a d means for forcing the end of said flexib e pipe into said opening to-formv a watertight joint between it and the drill steel around the transverse hole, said means serving also to retain the flexible'pipe in contact with the drill steel.

3. In a rock drillattachment ofthe nature indicated in combination a rock drill a drill steel mountedin the front end of said.

drill, said drillsteel having a longitudinal passage and a transverse passage communicating therewith the drill having an opening which communicates with said transverse passage, a flexible water supply pipe the ex tremity of which is projected into the opening in the drill and surrounds the transverse passage in the drill steel, said opening in the I drill, said drill steel having a'longitudinal' drill permitting of slight movement of that end of the flexible pipe which is in'eontact With the drill steel and means for-forcing the end of said flexible pipe into said opening to form a Water-tight joint between it and the drill steel around the transverse hole, said means serving also to retain the flexible pipein contact with the drill steel.

4. In a rock drill attachment of the nature indicated in combination a rock drill a drill steel mounted in the front end ofsaid drill, said drill steel having a longitudinal passage and a transverse passage communicating therewith the drill having an opening which communicates with said transverse passage, a flexible Water supply pipe the extremity of which is projected into the opening in the drill and surrounds the transverse passage in the drill steel, means for forcing the end of said flexible pipe into said opening to form a watertight joint between it and the drill steel around the transverse hole and means for preventing lateral expansion of the end of the flexible pipe when it is forced into the opening in the drill.

5. In water supplying attachments for rock drills the combination of a drill and a drill steel, the latter having a longitudinal hole and a transverse hole communicating therewith and the machine having an opening communicating with said transverse hole, a flexible water supply pipe, the end of which is projected into the opening in the machine so that it communicates with the transverse hole and means comprising a clamp fixed to the flexible pipe, a bow and a lever, the bow being attached to the clamp and loosely connected to the lever and the lever being pivotally attached to the machine at the opposite side to the flexible pipe for fixing the'latter to the machine, as set forth.

(5. In a device of the character described in combination a rock drill, a portion of which has a. bore to receive the drill steel or hit and an opening conununicating with said bore, a drill steel or bit having a longitudinal and transverse holes, the transverse hole communicating with the opening in the head, a flexible water supply pipe, the end of which is projected into the hole in the head and surrounds and incloses the trans.

verse hole in the steel, a ring or cylindrical piece surrounding a portion of the flexible pipe to prevent lateral expansion of the latter when it is forced into the hole in the head, and means for forcing the end of the flexible pipe into a hole in the head said means comprising a clamp fixed to the flexible pipe, a bow and alever, 'the bow being attached to the clamp and loosely connected to the lever and the lever being pivotally attached to the machine at the opposite side to the flexible pipe for fixing the latter to the machine, as set forth.

7. A device of the character described in combination a drill head having a longitudinal bore and a transverse opening communicating With said bore, a drill steel support ed by said head,said steel having a longitudinal passage and a transverse passage communicating with said longitudinal passage, the transverse passage communicating with the tranverse opening in the head, a flexible pipe placed in the opening and surrounding the inlet of the transverse hole in'the steel, a rigid tubular piece placed in the end of the flexible pipe, a clamp fixed around the flexible pipe and rigid tubular piece, a ring or hollow cylindrical piece placed around the flexible pipe between the clamp and the front head and partiallyentering the opening in the latter, the opening in the front head at its inner end being of oval shape to permit of movement of the end of the flexible pipe with the drill steel, a U bolt or how fixed to the clamp and passing around .the head,a lever fulcrumed tothe head through a hole in which lever the U bolt or bow passes the fulcrum of the lever and the hole through which the bolt or how passes being so positioned relative to each other that the lever in its one extreme position retains the flexible pipe in the opening in the head around the transverse hole in the steel and when moved to a suiiicient extent in the direction of its other extreme position permits the drill steel to be readily withdrawn from the head, as set forth.

In testimony whereof I have signed my nameto this specification in the presence of two subscribing witnesses.

CHARLES HANSEN.

Witnesses:

Cnas. OVENDAB, A. THOMPSON. 

